@media screen and (min-width: 60em){  
    .mix_4arts_01{
        width: 300px;
        margin-bottom: 36px;
    }
    .mix_4arts_01 .mix_4arts_01_top {
        /*min-height: 250px;
        max-height: 300px;*/
    }
    .mix_4arts_01 .mix_4arts_01_bottom {
        height: auto;
        width: 300px;
        clear: both;
        max-height: 250px;
    }
    .ie8 .mix_4arts_01 .mix_4arts_01_bottom {
        overflow: hidden;
    }


}